I have been using the email to OmniFocus option (just forward from your iPad to send-to-omnifocus@omnigroup.com) with pretty good success. You end up with an unwieldly next action item, but I prefer this method to installing another app.

This is an iOS solution only. If you are in email on your desktop, remember you can just right click and item and select ‘send to OmniFocus’ from context sensitive menu.